Black Box CL512A-F Manual de usuario

JANUARY 1998

CL512A-F

CL512A-M

Modular Current Loop Adapter

TX+

TX-

RX+

RX-

232 TO CL

CL TO 232

DTE

DCE

DTE

DCE

CL512

CUSTOMER

SUPPORT

INFORMATION

Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S. call 724-746-5500)

FREE technical support 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746

Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018

Web site: www.blackbox.com • E-mail: [email protected]

MODULAR CURRENT LOOP ADAPTER

TRADEMARKS USED IN THIS MANUAL

Any trademarks mentioned in this manual are acknowledged to be the property of

the trademark owners.

MODULAR CURRENT LOOP ADAPTER

Contents

Chapter Page

1. Specifications ..........................................................................................................4

2. Description..............................................................................................................5

3. Configuration and Installation ..............................................................................6

3.1 RS-232 Interface............................................................................................6

3.1.1 DCE or DTE Configuration ............................................................6

3.1.2 Connecting the RS-232 Device ........................................................6

3.2 Current-Loop Interface................................................................................7

3.2.1 Full-Duplex Operation ....................................................................8

3.2.2 Half-Duplex Operation..................................................................10

3.2.3 Connecting the Current-Loop Device ..........................................11

MODULAR CURRENT LOOP ADAPTER

Speed — Up to 19.2 Kbps

Maximum Distance — 1000 ft. (304.8 m)

Operation — Passive, 20-mA current loop, unipolar, mark=current,

space=no current

Interface — RS-232/V.24, DCE or DTE (switch-selectable), 20-mA

current loop

Connectors — RS-232: (1) DB25 male for CL512A-M, (1) DB25 female

for CL512A-F; Current Loop: (1) four-position screw

terminal strip and (1) RJ-11 (4-wire)

Enclosure — Metal

Power — +12 volts must be provided by EIA Interface (Pin 6

when unit is configured as a DTE, Pin 20 when

configured as a DCE); current provided by external

“active” device (20 mA, 24 VDC max.), optically isolated

for RS-232 signal protection

Size — 0.9" H x 2.1" W x 3" D (2.3 x 5.3 x 7.6 cm)

Weight — 2.1 oz. (59.5 g)

1. Specifications

MODULAR CURRENT LOOP ADAPTER

The Modular Current Loop Adapter connects current-loop equipment such as

industrial controllers and Data General computers to RS-232 equipment such as

modems, multiplexors, computers and terminals. The unit is a “passive” device:

this means it does not provide current for the current loop. The “passive” adapter

must connect to an “active” current-loop device. The “active” device provides the

20-mA current for the loop. (There can be only one active device in the current

loop.) The RS-232 interface of the attached equipment must provide a +12 voltage

on either pin 6 or pin 20 to power the adapter.

2. Description

MODULAR CURRENT LOOP ADAPTER

3.1 RS-232 Interface

3.1.1 DCE

DTE C

ONFIGURATION

The adapter connects easily to an RS-232 device such as a DTE (terminal,

computer) or DCE (modem, line driver, multiplexor).

The attached RS-232 device supplies power to the adapter via a positive (+12)

voltage on the adapter’s pin 20 (if the unit is configured as DCE) or pin 6 (if the

unit is configured as DTE). Pinnings for both configurations are shown below.

DTE DCE

Pin 2 = TD (output) Pin 2 = TD (input)

Pin 3 = RD (input) Pin 3 = RD (output)

Pin 6 = DSR (input) Pin 20 = DTR (input)

Pin 7 = Signal Ground Pin 7 = Signal Ground

To configure the adapter, simply move the external switch to the DTE or DCE

position. If you are going to plug the adapter into a DTE, move the adapter switch

to the DCE position. If you are going to plug the adapter into a DCE, move the

adapter switch to the DTE position.

3.1.2 C

ONNECTING THE

RS-232 D

EVICE

To connect the adapter to the RS-232 device, simply plug the unit’s DB25

connector into your RS-232 equipment’s DB25 connector. (The unit is available in

both male and female versions to accommodate your equipment.)

3. Configuration and Installation

MODULAR CURRENT LOOP ADAPTER

3.2 Current-Loop Interface

Review the following pinning guidelines before you connect the twisted-pair cable

from your current-loop device to the adapter’s RJ-11 port or four-position screw

terminal. Figure 3-1 shows the pin positions for both connectors.

Figure 3-1. Pin Positions for RJ-11 and Terminal Screw Block.

Connections on the current-loop side of the adapter may be full- or half-duplex. In

full-duplex transmission, both the adapter and the current-loop device may send

and receive data simultaneously. In half-duplex transmission, only one device at a

time may send or receive data. Section 3.2.1 describes full-duplex connections and

Section 3.2.2 discusses half-duplex connections.

1234

1 2 3 4

RX-TX+TX-RX+ RX-RX+TX-TX+

MODULAR CURRENT LOOP ADAPTER

3.2.1 F

ULL

-D

UPLEX

PERATION

Table 3-1. Pinouts for Full-Duplex Current-Loop Connections

RJ-11 Modular Pinnings:

1 = RX+, connect to the TX+ of your device.

2 = TX-, connect to the RX- of your device.

3 = TX+, connect to the RX+of your device.

4 = RX-, connect to the TX- of your device.

Terminal Block Pinnings:

1 = TX+, connect to the RX+ of your device.

2 = TX-, connect to the RX- of your device.

3 = RX+, connect to the TX+ of your device.

4 = RX-, connect to the TX- of your device.

Typical full-duplex applications for the adapter are shown in Figures 3-2 and 3-3. In

Figure 3-2, the unit is connected to a DTE device. In Figure 3-3, the unit is

connected to a DCE device.

NOTE

When connected to a DTE device, the adapter does not output pins 5

(CTS), 6 (DSR), or 8 (CD). If your computer (DTE) needs these pins

before it can send data, you must use a short cable with the proper pin

configuration between the computer and the unit. This entails looping

pin 4 (RTS) or any other signal at 12 volts to pins 5, 6, and 8 on the side

connected to the computer.

When connected to a DCE device, the adapter does not output pins 4

(RTS) or 20 (DTR), which your modem may need before it can send data.

If your modem needs these pins, you must use a short cable with the

proper pin configuration between the modem and the unit. This involves

looping pin 8 (CD) or any other signal on the interface that is at +12 V to

pins 4 and 20 on the side connected to the modem.

MODULAR CURRENT LOOP ADAPTER

Figure 3-2. Full-Duplex DTE Operation.

Figure 3-3. Full-Duplex DCE Operation.

FULL-DUPLEX (4-WIRE)

TX+

TX-

RX+

RX-

RX+

RX-

TX+

TX-

CL512

DCE DTE

COMPUTER

(DTE)

ASYNC COMPUTER

(ACTIVE CURRENT LOOP DEVICE)

FULL-DUPLEX (4-WIRE)

TX+

TX-

RX+

RX-

RX+

RX-

TX+

TX-

CL512

DCE DTE

MODEM

(DCE)

ASYNC COMPUTER

(ACTIVE CURRENT LOOP DEVICE)

MODULAR CURRENT LOOP ADAPTER

3.2.2 H

ALF

-D

UPLEX

PERATION

Table 3-2. Pinouts for Half-Duplex Current-Loop Connections

RJ-11 Modular Pinnings*

3 = + Loop

Jumper 1 to 2

4 = - Loop

Terminal Block Pinnings

1 = + Loop

Jumper 2 to 3

4 = - Loop

*Half-duplex operation is not recommended for RJ-11 connections due to the

difficulty involved in crossing Jumpers 2 and 3.

Typical half-duplex applications for the adapter are shown in Figures 3-4 and 3-5.

In Figure 3-4, the unit is connected to a DTE device. In Figure 3-5, the unit is

connected to a DCE device.

NOTE

When connected to a DTE device, the adapter does not output pins 5

(CTS), 6 (DSR), or 8 (CD). If your computer needs these pins before it

can send data, you must use a short cable with the proper pin

configuration between the computer and the unit. This entails looping

pin 4 (RTS) or any other signal at +12 volts to pins 5, 6, and 8 on the side

connected to the computer.

When connected to a DCE device, the adapter does not output pins 4

(RTS) or 20 (DTR). If your modem needs these pins before it can send

data, you must use a short cable with the proper pin configuration

between the modem and the unit. This involves looping pin 8 (CD) or

any other signal on the interface that is at +12V to pins 4 and 20 on the

side connected to the modem.

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